1978 Factory Tach Conversion...GM Sport Combo Gauge is no longer an option

[evlcunevl]

I have scrolled through past threads and do not see where my specific application was addressed. I have a factory clock gauge in the lower left corner and the fuel gauge to the right. I have seen this addressed where folks have the idiot light in the lower left and fuel to the right.

As of today GM Sports no longer sells the Tach/Fuel combo gauge. The story is the gentleman that made those has passed away. This was a solution for allot of us. I know I used one in the past on another project.

So this brings me to today. I know I'll need a big tach and a small fuel gauge, but will I need to replace my cluster and printed circuit board? If so to which orientation? Which wires need to be swapped around?

Has anyone done my application in the past?

Thanks in advance!